One only visits or contacts others when there is a specific purpose or need, implying that social calls are usually motivated by a request or problem.
小李平时很少联系我，这回突然打电话，准是无事不登三宝殿，有事要我帮忙了。
Li rarely contacts me, so this sudden call must mean he has a favor to ask, as one only visits when there's a purpose.
Era:
Ancient
Frequency:
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